Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

This shows how the wall of the pool continues southward from the pedestal. 

The Glovers were not on the pedestal at the time. They were on the grass at the time, just a little behind the sidewalk. If they were on the pedestal, they wouldn't have grass behind them. They would have water behind them.